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Maintenance Work on the Drive Unit
Ceramat® WA 160(X) Retractable Fitting
The drive unit must be removed, for example:
•
for general maintenance or inspection
•
to clean the calibration chamber, e.g. after a sensor has broken
•
to change the sensor / calibration-chamber gaskets
•
in the event of a technical fault of the drive unit.
Position indicator
WARNING!
When the drive unit must be removed under process conditions, be sure to wear
protective clothing, gloves, and goggles to protect yourself against process fluid that
might escape. The drive unit serves as second barrier after the ceramic rotary slides, i.e.
even after a breakage in the ceramics or a defect in the probe housing an uncontrolled
escaping of process fluid is prevented. When removing the drive unit under process
conditions, you must check whether the first barrier (rotary slides, probe housing)
functions properly.
NOTICE!
Before working on the drive unit make sure that the retractable fitting is in SERVICE
position. This position is attained by: the service switch (see Unical® 9000(X) installa-
tion manual) or the “Maintenance” menu of the Protos® 3400(X) (see user manuals of
PHU 3400(X)-110, FIU 3400X-140 or FIU 3400-141 modules).
While working on the retractable fitting, other persons must be prevented from
actuating the control unit.
The position indicator shows whether the retractable fitting is in SERVICE position.
